666702287 has 2 divisors, whose sum is σ = 666702288. Its totient is φ = 666702286.

The previous prime is 666702247. The next prime is 666702307. The reversal of 666702287 is 782207666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666702287 - 2¹² = 666698191 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666702217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333351143 + 333351144.

It is an arithmetic number, because the mean of its divisors is an integer number (333351144).

Almost surely, 2^666702287 is an apocalyptic number.

666702287 is a deficient number, since it is larger than the sum of its proper divisors (1).

666702287 is an equidigital number, since it uses as much as digits as its factorization.

666702287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 44.

The square root of 666702287 is about 25820.5787502914. The cubic root of 666702287 is about 873.5960230729.

The spelling of 666702287 in words is "six hundred sixty-six million, seven hundred two thousand, two hundred eighty-seven".